A new video, which offers a hands-on demonstration of the next-generation iPhone, was released on YouTube yesterday.

The nearly 5-minute video, which was released by parts reseller ETradeSupply, is not dramatically different from the leaked iPhone 5 pictures that hit the Web late last month. It confirmed a few suspicions while leaving other details in the dark for now.

Last month, 9 to 5 Mac managed to get its hands on some leaked photos of the next-generation iPhone. The pictures showed the backplates and frames of two upcoming iPhones -- one in black and one in white.

The video confirms what the pictures showed, which are backplates made of metal and plastic trim at the top and bottom. The metal antenna is molded into these metal backplates, likely as a way of making a unibody enclosure for stronger, yet thinner and lighter gadgets.

It also clearly confirmed that the next-generation iPhone will be the same width, yet longer. The screen will reportedly be longer with a size of 3.999 inches diagonally and will have a resolution of 1136 x 640. The video also shows a smaller dock connector and a relocated headphone jack.

One aspect of the next-generation iPhone that is left unclear is the size of the SIM card. Many believe it will be smaller in the next-generation iPhone, and the video shows that the SIM card holder piece is smaller in the new iPhone back piece than it was in the iPhone 4 and iPhone 4S. However, there is no actual measurement of the SIM card itself.